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Journal of Nanophotonics

Noise-driven signal transmission device using molecular dynamics of organic polymers
Author(s): Naoki Asakawa; Koichiro Umemura; Shinya Fujise; Koji Yazawa; Tadashi Shimizu; Masataka Tansho; Teruo Kanki; Hidekazu Tanaka
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Paper Abstract

Stochastic threshold devices using a trap-filling transition (TFT) coupled with molecular dynamics in poly(3-alkylthiophene)s were fabricated as potential key devices for noise-driven bioinspired sensors and information processors. This article deals with variable-temperature direct current conductivity and alternating current impedance measurements for vertical-type device elements of Au/regioregular poly(3-decylthiophene) ((RR−P3DT) (thickness:  100  nm)/Au, which show multiple conducting states and quasi-stochastic transitions between these states. Noise measurements indicate the ω−2-type (if V<VTFT=10  V) and ω−1-type (if V<VTFT) power spectral densities, where V and VTFT are an applied voltage and the voltage for TFT, respectively. The noise generation is due to the TFT associated with twist dynamics of π-conjugated polymers near the order-disorder phase transition (ODT). At 298 K, the quasi-stochastic behavior is more noticeable for RR-P3DT than poly(3-hexylthiophene). The quasi-stochastic property is employed to a stochastic one-directional signal transmitting device using optical-electric conversion. The dynamics of ODT for powder samples were also investigated by differential scanning calorimetry measurements and high-resolution solid-state 13C nuclear magnetic resonance spectroscopy, and the correlation of the molecular structure and dynamics with electric properties was discussed.

Paper Details

Date Published: 6 August 2014
PDF: 15 pages
J. Nanophoton. 8(1) 083077 doi: 10.1117/1.JNP.8.083077
Published in: Journal of Nanophotonics Volume 8, Issue 1
Show Author Affiliations
Naoki Asakawa, Gunma Univ. (Japan)
Koichiro Umemura, Gunma Univ. (Japan)
Shinya Fujise, Gunma Univ. (Japan)
Koji Yazawa, JEOL Ltd. (Japan)
Tadashi Shimizu, National Institute for Material Science (Japan)
Masataka Tansho, National Institute for Material Science (Japan)
Teruo Kanki, The Institute of Scientific and Industrial Research (Japan)
Hidekazu Tanaka, The Institute of Scientific and Industrial Research (Japan)

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